Add Hellfire font family (Regular, Bold versions)

[tromoSM]

Description:

This pull request adds the Hellfire font family to the Google Fonts repository. The font is designed by tromoSM and is licensed under the SIL Open Font License (OFL-1.1). Hellfire includes Regular and Bold weights in version 1.0, 1.2, and a developer access Legacy version. It is a modern sans-serif typeface, suitable for a wide range of design applications.

Font Details:

Name: Hellfire
Version: 1.0 (Regular), 1.2 (Regular), Legacy (Developer access)
Designer: tromoSM
License: Open Font License (OFL-1.1)
Category: Modern
Weights: Regular (400), Bold (700)
Glyph Count: 100+
Sample Text: "The quick brown fox jumps over the lazy dog."
Repository URL: [GitHub - tromoSM/fonts](https://github.com/tromoSM/fonts)
License URL: [OFL 1.1 License](https://opensource.org/licenses/OFL-1.1)

Changes Made:

Added Hellfire Regular and Hellfire Bold in two versions (1.0 and 1.2).
Added Hellfire Legacy version (including uppercase, lowercase, numbers, and signs).
Included metadata, readme files, and license documentation.

Notes:

The font family is fully licensed under OFL-1.1, and can be used for both personal and commercial use.
The font is open for collaboration and modification as per the terms of the license.